I think he got betrayed because of his kind attitude, he feels more humane than a demon. No wonder he can't escape his predicament, but I'll try to read more as this is just a conclusion to what I red so far
He's too kind and trusting to be a demon king it's just too unbelievable or maybe it's because of the "BEAUTIFUL ADOPTIVE SISTER" đ¤đ¤¨đđ đ đ